Northern Morocco Last Millennium Speleothem Oxygen Isotope Data Ait Brahim, Y.; Wassenburg, J.A.; Cruz, F.W.; Sifeddine, A.; Scholz, D.; Bouchaou, L.; Dassié, E.P.; Jochum, K.P.; Edwards, R.L.; Cheng, H. Ait Brahim, Y. Wassenburg, J.A. Cruz, F.W. Sifeddine, A. Scholz, D. Bouchaou, L. Dassié, E.P. Jochum, K.P. Edwards, R.L. Cheng, H. earth science/paleoclimate/speleothems (Grotte de Piste>LATITUDE 33.84>LONGITUDE -4.09) (Chaara Cave>LATITUDE 33.95>LONGITUDE -4.246) Here we present a new composite record from two well-dated speleothem records from two caves in Northern Morocco. The high-resolution record covers the last millennium allowing to detect multi-decadal to centennial periodicities. Over the industrial period, d18O values of our speleothems are shown to be dominated by the main mode of decadal variability in the North Atlantic region: the North Atlantic Oscillation (NAO). Statistical analyses confirm the previously reported multi-decadal variability related to the influence of the Atlantic Multidecadal Oscillation (AMO) in the region. High power and persistent centennial-scale periodicities, similar to the Vries-Suess 200-year solar cycle, are observed as well. Indeed, comparison between solar activity reconstructions and our record confirms the in-phase relationship on centennial time-scales. Low d18O values, and hence negative phases of NAO that bring precipitation towards the Western Mediterranean, are observed during well-known solar minima periods. The results are consistent with previous models which describe low irradiance as a trigger for southward shifts of precipitation-bearing westerlies during winter. STUDY NOTES: Oxygen isotope (d18O) data from stalagmites collected in 2 caves in Northern Morocco (Chaara Cave stalagmite CHA2 and Grotte de Piste stalagmite GP5) NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Ait Brahim, Y. Investigator : Wassenburg, J.A. Investigator : Cruz, F.W. Investigator : Sifeddine, A. Investigator : Scholz, D. Investigator : Bouchaou, L. Investigator : Dassié, E.P. Investigator : Jochum, K.P. Investigator : Edwards, R.L. Investigator : Cheng, H. 2019-01-03 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/25970 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/chaara2018d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2018d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/chaara2018d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2018d18o.txt English https://www.ncdc.noaa.gov/paleo/study/25970 https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/chaara2018d18o.txt https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2018d18o.txt Yassine Ait Brahim, Jasper A. Wassenburg, Francisco W. Cruz, Abdelfettah Sifeddine, Denis Scholz, Lhoussaine Bouchaou, Emilie P. Dassié, Klaus P. Jochum, R. Lawrence Edwards, Hai Cheng2018Multi-decadal to centennial hydro-climate variability and linkage to solar forcing in the Western Mediterranean during the last 1000 yearsScientific Reports810.1038/s41598-018-35498-xhttps://www.nature.com/articles/s41598-018-35498-x START YEAR: 1039 cal yr BP * END YEAR: -50 cal yr BP -4.246 33.84 -4.09 33.95